condition mean min max ZT0-3 3.580426666666666 0.6564384999999999 9.010874999999999 ZT4-7 11.104700000000001 11.104700000000001 11.104700000000001 ZT8-11 9.061215 9.061215 9.061215 ZT12-15 7.5480225 4.301765 10.79428 ZT16-19 3.365995 3.365995 3.365995 ZT20-23 1.77746 1.77746 1.77746